(Pronounced: butthole balloon-na-nye-tis) Another word for anal prolapse, which is when the inside of your rectum is hanging out of your anus and resembles deflated balloons (where it gets its name) or roast beef curtains.
The porn stars' anus was gaping so bad that they had butthole balloonanitis.

Dude, you might want to go to a doctor because your butthole balloonanitis looks like your whole rectum is falling out!
by Shittle Bits December 7, 2018
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